Yûichi Iguchi

Thanks to his parents' job transfer, high school freshman Kazunari Usa finally gets to enjoy living on his own in the Kawai Complex, a boarding house that provides meals for its residents. Ritsu, the senpai he admires, also lives in Kawai Complex, as do a few other "unique" individuals: his masochistic roommate Shirosaki; beautiful, big-breasted Mayumi who has no luck in finding men; and sly, predatory college woman Sayaka. Surrounded by these people, Usa never finds his daily life boring. (myanimelist.net)

Since the graduation of the senior members of the club, Takezou ends up being the sole member of the "Koto" (traditional Japanese string instrument) club. Now that the new school year has begun, Takezou will have to seek out new members into the club, or the club will become terminated. Out of nowhere, a new member barges into the near-abandoned club room, demanding to join the club. How will Takezou be able to keep his club alive and deal with this rascal of a new member? (imdb)